Vapor generator



H. H. HEMENWAY VAPOR GENERATOR Filed Dec.

Sept. 12, 1950 INVENTOR HENRY hf HEMf/V WA Y BY 9 5 ATTORNEY Patented Sept. 12, 1950 UNITED STATES i ATENT OFFICE VAPOR GENERATOR Henry H. Hemenway, St. Albans, N. Y., assignor to Foster Wheeler Corporation, New York, N. Y., 1 a corporation of New York Application December 13, 1945, Serial No. 634,763

'6 Claims.

' forming a part thereof and in which the single figure is a more or less diagrammatic view in vertical section of a steam generator embodying the invention.

Referring to the drawing, the steam generator illustrated has a setting generally designated having side walls H and 2, a front wall l3, a bottom Hi, a roof portion 55 and a rear wall not shown. The generator has two steam and water drums i6 and El at the upper ends of side walls H and I2 respectively, and a single water drum l3 disposed at the bottom of the setting at a point intermediate the side walls I I and I2.

A first bank of vertically inclined steam generating tubes it connects steam and water drum l6 and drum l8, and a second bank of steam generating tubes 23 connects the steam and water drum I! and drum it, the bank 243 being inclined oppositely to the direction of inclination of the tubes of bank It. A superheater 2| is disposed in bank 28.

The bank of steam generating tubes 19 and side wall 1 l define in part a boiler furnace 22, and steam. generating bank 263 and side wall 92 define another furnace 23 which may for convenience be designated a superh-eater furnace.

Boiler furnace 22 is fired by a plurality of fluid fuel burners 24 which. may burn pulverized coal, oil or gas, and superheater furnace 23 is fired by a plurality of fluid fuel burners 25.

Side wall I! is lined by a row of Water wall tubes 26 which extend between drum i and header 2! at the lower end of side wall H. Side wall I2 is lined by a row of water wall tubes 28 which extend from the drum H to a header 29 at the lower end of side wall 42. If desired, the front and rear walls of the furnaces 22 and 23 as well as their bottoms may be provided with water walls.

The steam and water drums H5 and H are con nected below their normal water lines with a plurality of tubular members 36 which define with the banks of tubes is and 23, a gas chamber 35. The steam spaces of the drums l6 and I! are connected by a plurality of tubular members 32. A heat recovery device such as an economizer 33, is disposed in the flue 34 between the tubular members 3!] and 32. The gases produced in the furnace after flowing over the economizer 33 flow out through a flue or stack 35. Steam withdrawn from drums it and IT through lines 38 and 3'! respectively. These lines may be joined or otherwise arranged to conduct saturated steam to a point of use, or to conduct steam to the superheater 2 i, or both.

In operation, the products of combustion produced in boiler furnace 22 by burners 2 3 how over steam generating tubes I9, through gas chamber 3!, over tubes 38, over economizer 33, over tubes 32, and out the stack 35. The products of combustion produced in superheater furnace 23 by burners 25, how over steam generating tubes 21], over superheater 2!, through gas chamber 3!, over tubes 30, over economizer 33, over tubes 32, and out the stack If saturated steam only is desired, the burners 24 will be fired but the burners 25 will not. burners 25 will be fired, and at low'loads, the

burners 2 will not be fired or will be fired only at low intensity. The quantity of steam produced and the degree of superheat attained will be dependent upon the number of burners 24 and 25 which are in operation, and the intensity of their firing. Variations in the number and intensity of the filil'lg of the burners 2: and 25 will produce any desired quantity of steam and practically any desired superheat, within the limits of the apparatus.

Inasmuch as changes may be made in the form, location and relative arrangement of the several parts of the generator disclosed, without departing from the essential characteristics of the invention, it will be understood that the invention is not to be limited exceptin by the scope of the appended claims.

What is claimed is:

1. Vapor generating apparatus comprising a setting, two spaced upper vapor and liquid drums in the setting, said drums having a vapor space in the upper part thereof and a liquid space in the lower part, a lower liquid drum in the setting intermediate the upper drums, 'circulator tubes in communication at the opposite ends thereof with the vapor spaces of said drums, other cir culatcr tubes in communication at the opposite ends thereof with the liquid spaces of the drums,

said circulator and said other circulator tubes extending in spaced substantially parallel planes, heat recovery apparatus disposed in the space between the circulator tubes, a bank of vertically inclined vapor generating tubes connecting one of the upper drums with the lower drum, another When superheat is desired, the

bank of vertically inclined vapor generating tubes connecting the other upper drum with said lower drum, one side of said bank and one side of said other bank of vapor generating tubes defining opposite sides of a substantially V-shaped gas passage included between the banks, a gas outlet at the upper part of the setting above the circulator tubes between the upper drums and in communication with the gas passage, said gas outlet being arranged to receive gases from said passage after the gases have passed in heat exchange relationship with said circulator tubes, the heat recovery apparatus and said other circulator tubes, a furnace in the setting at the side of each of said tube banks opposite said one side of each bank, and means for firing each furnace.

2. Vapor generating apparatus comprising a setting, two spaced upper vapor and liquid drums in the setting, said drums having a vapor space in the upper part thereof and a liquid space in the lower part, a lower liquid drum in the setting intermediate the upper drums, circulatortubes in communication at the opposite ends thereof with the vapor space of said drums, other circulator tubes in communication at the opposite ends thereof with the liquid spaces of the drums, said circulator and said other circulator tubes extending in spaced substantially parallel planes, heat recovery apparatus disposed in the space between the circulator tubes, a bank of spaced vertically inclined vapor generating tube connecting one of the upper drums with the lower drum, another bank of spaced vertically inclined vapor generating tubes connecting the other upper drum with said lower drum, one side of said bank and one side of said other bank of vapor generating tubes defining opposite sides of a substantially V-shaped gas passage included between the banks, a furnace in the setting at the side of each of said tube banks opposite said one side of each bank, means for firing each furnace, said tube banks being constructed and arranged for gas flow from the furnaces transversely of said banks and into the passage, a gas outlet at the upper part of the setting between the upper drums and in communication with the gas passage, said gas outlet being arranged to receive gases from said passage after the gases have passed in heat exchange relationship with said circulator tubes, the heat recovery apparatus and said other circulator tubes, and a superheater disposed in one of said tube banks in the path of fiow of gases flowing transversely through onl said one bank.

3. Vapor generating apparatus comprising a setting, two spaced upper vapor and liquid drums in the setting, said drums being positioned in substantially the same horizontal plane and each having a vapor space in the upper part thereof and a liquid space in the lower part, circulator tubes in communication at the opposite ends thereof with the vapor spaces of said drums, other circulator tubes in communication at the opposite ends thereof with the liquid spaces of said drums, said circulator tubes and said other circulator tubes extending in vertically spaced substantially horizontal planes, heat recovery apparatus disposed in the space between the circulator and other circulator tubes, a lower liquid drum in the setting intermediate the upper drums, a bank of vertically inclined vapor generating tubes connecting one of the upper drums with the lower drum, another bank of vertically inclined vapor generating tubes connecting the other upper drum with said lower drum, one side of said bank and one side of said other bank of vapor generating tubes defining opposite sides of a substantially V-shaped gas passage included between the banks, a gas outlet at the upper part of the setting between the upper drum and in communication with the gas passage, said gas outlet being arranged to receive gases from said passage after the gases have passed in heat exchange relationship with said circulator tubes, the heat recovery apparatus and said other circulator tubes, a furnace in the setting at the side of each of said tube banks opposite said one side of each bank, and means for firing each furnace.

4. Vapor generating apparatus comprising a setting, two spaced upper vapor and liquid drums in the setting, said drums being positioned in substantially the same horizontal plane and each having a vapor space in the upper part thereof and a liquid space in the lower part, substantially horizontally extending circulator tubes connected at the opposite ends thereof with the vapor spaces of said drums, other substantially horizontally extending circulator tubes connected at the opposite ends thereof with the liquid spaces of said drums, said circulator tubes and said other circulator tubes extending in vertically spaced substantially horizontal planes, heat recover apparatus disposed in the space between the circulator and other circulator tubes, a lower liquid drum in the setting intermediate the upper drums, a bank of vertically inclined vapor generating tubes connecting one of the upper drums with the lower drum, another bank of vertically inclined vapor generating tubes connecting the other upper drum with said lower drum, one sidev of said bank and one side of said other bank of vapor generating tubes defining opposite sides of a substantially V-shaped gas passage included between the banks, a gas outlet at the upper part of the setting above said circulator tubes between the upper drums and in communication with the gas passage, said gas outlet being arranged to receive gases from said passage after the gases have passed in heat exchange relationship with said circulator tubes, the heat recovery apparatus and said other circulator tubes, said gas passage being unobstructed beneath said other circulator tubes, a furnace in the setting at the side of each of said tube banks opposite said one side of each bank, and means for firing each furnace.

5. Vapor generating apparatus comprising a setting, two spaced upper vapor and liquid drums in the setting, said drums being positioned in substantially the same horizontal plane and each having a vapor space in the upper part thereof and a liquid space in the lower part, substantially horizontally extending circulator tubes connected at the opposite ends thereof with the vapor spaces of said drums, other substantially horizontally extending circulator tubes connected at the opposite ends thereof with the liquid spaces of said drums, said circulator and other circulator tubes being vertically spaced from one another, heat recovery apparatus disposed in the space between the circulator and other circulator tubes, 2, lower liquid drum in the setting intermediate the upper drums, a bank of vertically inclined vapor generating tubes connecting one of the upper drums with the lower drum, another bank of vertically inclined vapor generating tubes connecting the other upper drum with said lower drum, one side of said bank and one side of said other bank of vapor generating tubes defining opposite sides of a substantially V-shaped gas passage included between the banks, a gas outlet for the setting above said circulator tubes and between the upper drums,

said gas outlet being arranged to receive gases from said passage after the gases have passed in heat exchange relationship with said other circulator tubes, the heat recovery apparatus, :and said circulator tubes, said gas passage being unobstructed beneath said other circulator tubes, a furnace in the setting at the side of each of said tube banks opposite said one side of each bank, means for firing each furnace, and a superheater disposed in the setting in heat exchange relationship with gases of combustion flowing from one furnace only to said gas passage.

6. Vapor generating apparatus comprising a setting, two spaced upper vapor and liquid drums in the setting, said drums being positioned in substantially the same horizontal plane and each having a vapor space in the upper part thereof and a liquid space in the lower part, substantially horizontally extending circulator tubes connected at the opposite ends thereof with the vapor spaces of said drums, other substantially horizontally extending circulator tubes connected at the opposite ends thereof with the liquid spaces of said drums, said circulator and other circulator tubes being vertically spaced from one another, heat recovery apparatus in the space between the circulator and other circulator tubes, a lower liquid drum in the setting intermediate the upper drums, a bank of spaced vertically inclined vapor generating tubes connecting one of the upper drums with the lower drum, another bank of drum, one side of said bank and one side of said other bank of vapor generating tubes defining opposite sides of a substantially V-shaped gas passage included between the banks, said gas passage being unobstructed beneath said other circulator tubes, a furnace in the setting at the side of each of said tube banks opposite said one side of each bank, means for firing each furnace, said tube banks being constructed and arranged for gas flow from the furnaces transversely of said banks and into the passage, a gas outlet for the setting :abovesaid circulator tubes and between the upper drums, said gas outlet being arranged to receive gases from said passage after the gases have passed in heat exchange relationship with said other circulator tubes, the heat recovery apparatus and said circulator tubes, and a superheater disposed in one of said tube banks in the path of flow of gases passing transspaced vertically inclined vapor generating tubes connecting the other upper drum with said lower versely through only said one bank.

HENRY H. HEMENWAY.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Rehm July 18, 1944 

